I have an issue with my A51 around bluetooth controls with my devices. The volume will work still but the forward, reverse and pause functions will not work on the remote devices. I've experienced the issue with my Sony car stereo, Bose NC700 headphones and now Sony WH-1000XM4 headphones. If I connect the headphones to my laptop, the device functions well which leads me to believe it's a problem with the A51 bluetooth functionality.
I've cleared the bluetooth cache and would appreciate any other suggestions.